How to calculate the theoretical capacity of battery electrode materials
The theoretical capacity of a battery electrode material can be estimated using the relation:
where F is the Faraday constant, x is the number of faradays involved in the reaction, and M is the molar mass of the material.
Hence, according to Eq.1, the theoretical charge or discharge capacity of LiCoO2 can be calculated to be 274 mAh/g, using 1.0, 26.80 Ah/mol, and 97.87 g/mol for x, F and M, respectively.
Likewise, according to Eq.2, the theoretical charge or discharge capacity of graphite (C) can be calculated to be 372 mAh/g, using 1/6, 26.80 Ah/mol, and 12 g/mol for x, F and M, respectively.
Examples are shown in the table below.
|Anode||Cathode||x/ mol||Thoeretical Capacity/ mAh g-1||Attainable Capacity/ mAh g-1|